Solar cell silk-screen printing method and photovoltaic module

Abstract

The invention discloses a solar cell silk-screen printing method. The method comprises the steps that high tensile silver paste is placed on the upper surfaces of first screen printing plates, under extrusion of a scraping knife, the high tensile silver paste is printed on the upper surface of a solar cell, and a solar cell printed with a main grid line is obtained; the solar cell printed with the main grid line is dried, and the dried solar cell is obtained; auxiliary grid silver paste good in printing and good in ohmic contact is placed on the upper surfaces of second screen printing plates, under extrusion of the scraping knife, the auxiliary grid silver paste good in printing and ohmic contact is printed on the upper surface of the dried solar cell, and the solar cell printed with the main grid line and the auxiliary grid line is obtained; and the number of the first screen printing plates is smaller than the number of the second screen printing plates. According to the solar cell silk-screen printing method, different screen printing plates and silver paste are adopted for printing the main grid line and the auxiliary grid line, the making cost of the solar cell can be reduced, the conversion efficiency is improved, and in addition, photovoltaic module with the advantages is provided.

Description

technical field [0001] The present application relates to the technical field of photovoltaic module preparation, in particular to a solar cell screen printing method and a photovoltaic module. Background technique [0002] With the decrease of non-renewable fossil energy reserves and the pollution caused to the environment, solar energy, as a clean energy with unlimited reserves and no pollution during use, has been widely developed and utilized. [0003] With the development of the photovoltaic industry, photovoltaic enterprises have made higher requirements on the production technology and production cost of photovoltaic modules, and need to improve the photoelectric conversion efficiency of photovoltaic modules while reducing costs. In the field of solar cell manufacturing, the cost of paste, especially the front printing silver paste occupies the main part of the manufacturing cost. Under the premise of ensuring electrical performance, reducing the amount of paste used ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, when printing silver paste on the front of the solar cell to form the main grid and sub-grid, the functions of the main grid and the sub-grid are comprehensively considered, and a paste is selected to meet the pulling force requirements of the main grid. It is also necessary to meet the printability requirements of the sub-grid lines. Use the paste and the same grid screen to print the main grid lines and sub-grid lines at the same time. The width of the sub-grid lines is generally 26 to 28 μm, and the cost of the paste is high. , and when the mesh material and the slurry do not achieve a good match, the series resistance will increase due to the thinning of the auxiliary grid, which will eventually lead to a decrease in the efficiency of the solar cell

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